JP2850596B2 - Intake device for multi-cylinder internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for a multi-cylinder internal combustion engine.

[0002]

2. Description of the Related Art An internal space of a surge tank whose one end face is connected to an air cleaner via an intake duct extends in the direction of the one end face and is divided into two parts by a partition provided with an intake control valve. 2. Description of the Related Art An intake device of a multi-cylinder internal combustion engine in which a first cylinder group is connected to an internal space and a second cylinder group is connected to the other internal space is known.

In this intake system, the equivalent intake pipe length of each cylinder is made relatively long immediately before the intake duct by fully closing the intake control valve during low-speed operation of the internal combustion engine. By fully opening the intake control valve, by making the equivalent intake pipe length relatively short immediately before the surge tank, during both operations, a good inertial supercharging effect is obtained, and the charging efficiency is increased. High torque can be obtained.

[0004] When the intake control valve is mounted, it is inserted into a partition wall hole where it closes, is manually pressed from one side of the partition, and is screwed to the drive shaft from the opposite side by a tool such as a screwdriver. Such a mounting operation is very difficult in a surge tank. In order to solve this problem, Japanese Utility Model Laid-Open Publication No. Sho 62-88832 discloses that a surge tank is provided with an opening at one end face opposite to the one end face to which the intake duct is connected, and a partition wall in the surge tank is provided. A U-shaped notch around the opening is formed, and the intake control valve holder having a wall portion fitted with the notch and having an intake control valve attached thereto and a flange portion sealing the opening is surged. What is provided separately from the tank is described.

According to this intake device, after the intake control valve is mounted on the intake control valve holder, the intake control valve holder can be assembled to the surge tank by bolts or the like by using the flange portion. When the valve is mounted, the wall portion of the intake control valve holder to which the valve is mounted is completely exposed on both sides, so that the mounting operation can be facilitated.

[0006]

The above-mentioned intake device is provided with an intake control valve holder which is separate from the surge tank in order to facilitate the work of mounting the intake control valve.
A joint is formed between the holder and the cutout of the surge tank and the partition wall, and a rubber packing is used to make the joint airtight.

[0007] The rubber packing is usually installed between the two members, and is compressed by appropriately tightening the two members to ensure good airtightness. For the joint between the flange portion of the intake control valve holder and the surge tank, there is no problem with airtightness because the rubber packing is used in this way, but the wall portion of the intake control valve holder and the partition of the surge tank With respect to the joint between the notch and the notch, there is a portion where the rubber packing must be compressed in a direction substantially perpendicular to the tightening direction of the holder, and this compression causes the wall of the intake control valve holder to be compressed by the surge tank. It is intended to be performed by insertion into a notch in the septum.

[0008] Such compression of the rubber packing results from the beginning of the insertion of the wall part into the notch, and in particular the rubber packing of this part has considerable friction until the insertion is completed. The force acts continuously. Therefore, the rubber packing in this portion is elongated in the longitudinal direction by this frictional force, and loses a predetermined thickness and hardness, so that good airtightness cannot be guaranteed.

Therefore, even if the intake control valve is fully closed, the internal space of the surge tank is not completely divided into two parts, and a desired torque cannot be obtained because the inertial supercharging effect is reduced. Also, this leakage causes problems such as generation of airflow noise.

Accordingly, an object of the present invention is to make it easy to attach an intake control valve to a partition wall of a surge tank,
It is an object of the present invention to provide an intake device for a multi-cylinder internal combustion engine that can completely seal a seal portion of a surge tank.

[0011]

In order to achieve the above-mentioned object, a suction device for a multi-cylinder internal combustion engine according to the present invention has a first structure in which an inner space of a surge tank is formed by a partition extending in a longitudinal direction of the surge tank. A first cylinder group is connected to the first chamber, and a second cylinder group is connected to the second chamber. The surge tank is located at a longitudinal center of the surge tank. A first cut surface for cutting the partition wall substantially parallel to a line and substantially perpendicular to the partition wall, and a second cut surface for cutting the outer wall of the surge tank substantially parallel to the first cut surface in a thickness direction. The cutting surface and a third cutting surface, which is substantially parallel to the partition wall and cuts the outer wall in a substantially thickness direction, are divided into a large first divided body and a small second divided body. The opening and closing of the partition is controlled according to the operating state of the internal combustion engine. Intake control valve is provided that the first
The divided body and the second divided body are characterized in that a seal member is provided on each of the cut surfaces, and the divided body and the second divided body are assembled with bolts or the like in a direction of joining at least the second cut surface and the third cut surface. .

[0012]

In the above-described intake device for a multi-cylinder internal combustion engine, the surge tank is divided into a first divided body and a second divided body, and a partition wall of the second divided body to which the intake control valve is attached is a third cut surface. In order to easily reach one side from the opening formed by the second cut surface to the back side thereof, the mounting operation of the intake control valve was inserted into the hole for the intake control valve. This can be easily performed by manually holding the intake control valve from behind the partition and screwing it to the drive shaft from the exposed side with a tool such as a screwdriver.

On the other hand, the second divided body to which the intake control valve is attached and the first divided body are assembled on each cut surface via a seal member, but the first cut surface and the second cut surface are substantially parallel. Since the third cut surface forms an angle of about 90 ° with them, during this assembly, the seal member fixed to each cut surface of one split body and each of the other split body The cutting surface is aligned without frictional force, and the second
Since each of the seal members is extended in the longitudinal direction, the predetermined thickness and hardness are not lost, and the bolts and the like are appropriately used. It is compressed, and the inside and outside of the surge tank and the space between the first chamber and the second chamber are completely sealed.

[0014]

1 shows an embodiment of an intake device for a multi-cylinder internal combustion engine according to the present invention. FIG. 1 shows a case where the internal combustion engine has six cylinders. In the surge tank 1, six intake pipes 2a, 2b, 2c, 2d, 2e, and 2f communicating with the respective cylinders, and an air cleaner (see FIG. (Not shown) are connected to two intake ducts 3a and 3b.

FIG. 2 is an exploded view of the intake device shown in FIG. 1, and FIG. 3 is a sectional view of the surge tank 1 perpendicular to the longitudinal direction. As shown in these figures, the internal space of the surge tank 1 is divided into a first chamber 4a and a second chamber 4b by a vertical partition wall 1a extending in the longitudinal direction. The intake pipes 2a, 2b, and 2c communicating with the first chamber are for the first cylinder group whose intake strokes do not overlap each other.
d, 2e, and 2f are for the same second cylinder group.
The two intake ducts 3a and 3b communicate with the first chamber and the second chamber, respectively, and are connected to a throttle body (not shown) having a throttle valve by a flange 5 fixed to the other side.

A hole 6 is provided in the partition 1 a of the surge tank 1, and an intake control valve 7 capable of opening and closing the hole 6 is screwed to a drive shaft 8. The drive shaft 8 is connected to a diaphragm actuator 9 and is moved so that the intake control valve 7 is fully opened during high-speed operation of the internal combustion engine and is fully closed during low-speed operation.

Each of the intake pipes 2a, 2b, 2c, 2d, 2e,
2f, a first chamber 4a and a second chamber 4b, and each intake duct 3
Since a and 3b are formed so that there is not much change in the cross-sectional area, by driving the intake control valve 7 as described above, when the internal combustion engine is operating at a low speed, the equivalent intake pipe length is reduced by the intake valve. (Not shown) to a portion immediately before the flange 5, and during high-speed operation, the intake control valve 7 is fully opened, and the first chamber 4a and the second chamber 4b in the surge tank 1 are communicated. Therefore, the equivalent intake pipe length is relatively short from the intake valve to immediately before the surge tank 1, so that a good inertia supercharging effect can be obtained during both operations and a high torque can be obtained by increasing the charging efficiency. Can be.

The surge tank 1 of this embodiment has a first cut surface 10a for cutting a partition 1a substantially parallel to a longitudinal center line of the surge tank 1 and substantially perpendicular to the partition 1a, and a first cut surface 10a. A second cut surface 10b which is substantially parallel and cuts the outer wall 1b of the surge tank 1 in a substantially thickness direction, and a partition wall 1a
And a third cut surface 10c which cuts the outer wall 1b substantially in the thickness direction, and is divided into a large first divided body 1 'and a small second divided body 1 ". The valve 7 is provided on the partition 1 "a of the second divided body 1".

Thus, the operation of mounting the intake control valve 7 is as follows. After the drive shaft 8 and the diaphragm actuator 9 are mounted on the second divided body 1 ", the intake control valve 7 is moved to the partition 1" a of the second divided body 1 ". Of the second divided body 1 ″
Of the partition wall 1 "a completely exposed by the third cut surface of the second divided body 1" using a tool such as a screwdriver or the like. This is easy because it can be screwed to the drive shaft 8.

Thus, the intake control valve 7 is connected to the second divided body 1 ".
Is attached, the second divided body 1 "and the first divided body 1 'are assembled. In this assembling, the cut surfaces 10a, 10b, 10c of the second divided body 1" are provided with sealing members, respectively. The rubber packings 12a, 12b, 12c are adhered,
These rubber packings 12a, 12b, 12c and the cut surfaces 10a, 10b, 10c of the first divided body 1 'are aligned. At this time, the first cut surface 1a and the second cut surface 10a
b and the first cut surface 10c form an angle of about 90 °
, The rubber packings 12a, 12b, 12c
Are cut surfaces 10a, 10b, 10c of the first divided body 1 '.
The frictional force does not act on it, and it is prevented from being elongated and reduced in thickness or hardness.

The surge tank 1 has a plurality of three sections shown in FIG. (A) is a section having a bolt 13a for joining the partition walls 1'a and 1 "a cut by the first cut surface 10a, and (B) is an outer wall 1 'cut by the second cut surface 10b. b and a cross section having a bolt 13b for joining 1 ″ b, FIG.
c is a cross section having bolts 13c for joining the outer walls 1'b and 1 "b cut by c.

These three types of bolts 13a, 13b, 1
By 3c, the rubber packings 12a, 12b, 12c are appropriately compressed, ensuring good airtightness, and the first divided body 1 'and the second divided body 1 "are securely assembled.

If the first cut surface 10a and the second cut surface 10b are the same as in this embodiment, the processing of these seal surfaces can be performed simultaneously, and the processing time can be reduced.

Although the present embodiment has shown the case of a surge tank having a circular cross section, it is apparent that the present invention can be applied to a surge tank having a rectangular and other polygonal cross sections.

The bolts 13a and 13b are for tightening in the same direction, and it is possible to omit one of the bolts.

The intake device of this embodiment is designed for
If the flange 5 is on the right side when viewed from the front of the vehicle, the cut surface of the surge tank 1 and the assembly bolts 13a, 13b, 13
c does not enter the field of view and is very favorable in appearance.

[0027]

As described above, according to the intake system for a multi-cylinder internal combustion engine according to the present invention, the installation of the intake control valve on the partition wall of the surge tank allows the surge tank to be divided into the first divided body and the second divided body. It can be easily performed by dividing the body into two parts, and the assembly of the second divided body and the first divided body after the intake control valve is attached can be performed without abnormally deforming the seal member provided on each cut surface. It is possible to reliably perform the sealing by using bolts in the direction of appropriately compressing the seal members, and it is possible to prevent the inertial supercharging effect from being reduced due to poor sealing and prevent the generation of airflow noise.

[Brief description of the drawings]

FIG. 1 is a perspective view of an intake device for a multi-cylinder internal combustion engine according to the present invention.

FIG. 2 is an exploded view of the intake device of FIG.

FIGS. 3A and 3B are three cross-sectional views of the intake device of FIG. 1 in which the surge tank has a different longitudinal position; FIG.
(B) shows the second cross section, and (C) shows the third cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Surge tank 1 '... 1st divided body 1 "... 2nd divided body 1a, 1'a, 1'b ... Partition wall 1b, 1'b, 1" b ... Outer wall 4a ... 1st chamber 4b ... 2nd chamber 7 intake control valve 10a first cut surface 10b second cut surface 10c third cut surface 12a, 12b, 12c rubber packing 13a, 13b, 13c bolt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-247121 (JP, A) JP-A-62-121828 (JP, A) Fully open 63-156420 (JP, U) Really open 1962 88832 (JP, U) Japanese Utility Model 1987-16722 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F02B 27/02 F02M 35/104

Claims (1)

(57) [Claims] 1. A first chamber and a second chamber, wherein an inner space of a surge tank is formed by a partition extending in a longitudinal direction of the surge tank.
A first cylinder group is connected to the first chamber, and a second cylinder group is connected to the second chamber. The surge tank is substantially parallel to a longitudinal center line of the surge tank. A first cut surface that cuts the partition wall substantially perpendicular to the partition wall, a second cut surface that cuts the outer wall of the surge tank substantially in parallel with the first cut surface in a thickness direction, A third cutting the outer wall substantially in the thickness direction substantially parallel to the partition wall;
A large first split and a small second
An intake control valve that is divided into two parts and that is opened and closed in accordance with an operating state of the internal combustion engine is provided on a partition wall of the second divided body. The first divided body and the second divided body are An intake device for a multi-cylinder internal combustion engine, wherein a seal member is provided on each cut surface and assembled by bolts or the like in a direction for joining at least the second cut surface and the third cut surface.